I was with Sam Saturday and echo his thoughts. I think it's important to maintain good PR with the park, for instance the backcountry desk seemed very frustrated that none of the parties this year had given feedback about their run. I see "feedback from your run" as a great opportunity to tell the park how low it was on the top, how comfortable you felt in the meat of the run, etc. As far as they know every run in there is an epic.
It's arduous to get in the first 6 miles, but totally worth it. Some tips:
you can hike the road on river left about 2 miles of easy walking. You can put a tether on your boat and push pull it along through the 40 cfs. You don't always need your sprayskirt on 40 cfs. Start early.
I don't want to classify the rapids but do remember every consequential move involved wood. So take browns canyon and throw 4 or 5 60 foot logs in choice places. Or what about Marsh Creek, I don't think it even has rapids, but you can get in trouble with wood. There is only one portage after the confluence as of Saturday.
I think that, unless there's a lot of rain, yesterday was the melt peak. It should be shaping up to be ideal this weekend. If you keep an eye on the gauge, with cold fronts moving through, you should be able to find a peak under 600 cfs when it is on its way up. I think the snotel gauge, especially minimum overnight temperature, is as valuable as the CFS gauge.
SNOTEL Data Report - Daily Readings
Have a great time and be a good ambassador, as sam said the rangers, the backcountry desk, and 300 tourists at the takeout are watching to see how boating goes in there this spring. And ditto the timpoweap suggestion, despite the hike in putin, and need to call Pah tempe for takeout permission, it has 80% of the virgin's whitewater in 3 miles.